Airfoil having environmental barrier topcoats that vary in composition by location
AssigneeRtx Corporation
InventorsRichard Wesley Jackson, Adam P. Generale, Xuan Liu, Mark F. Zelesky
Life of this patent
Estimating the term…
Abstract
An airfoil includes an airfoil wall that defines a leading end, a trailing end, and suction and pressure sides that join the leading end and the trailing end. The airfoil wall is formed of a silicon-containing ceramic. A first environmental barrier topcoat is disposed on the suction side of the airfoil wall, and a second, different environmental barrier topcoat is disposed on the pressure side of the airfoil wall. The first topcoat is vaporization-resistant and the second topcoat is resistant to calcium-magnesium-aluminosilicate.
Claims17
An airfoil comprising:
- an airfoil wall defining a leading end, a trailing end, and suction and pressure sides joining the leading end and the trailing end, the airfoil wall being formed of a silicon-containing ceramic;
- a first environmental barrier topcoat disposed on the suction side of the airfoil wall, the first environmental barrier topcoat is of a composition that is selected from HfO2, HfSiO4, and combinations thereof;
- and
- a second, different environmental barrier topcoat disposed on the pressure side of the airfoil wall, the second environmental barrier topcoat is of a composition that is selected from a mixture of HfSiO4 and calcium aluminosilicate, Ca2Y8(SiO4)6O2, a mixture of HfO2, HfSiO4 and calcium aluminosilicate, and combinations thereof.
A gas turbine engine comprising:
- a compressor section;
- a combustor in fluid communication with the compressor section;
- and
- a turbine section in fluid communication with the combustor,
- the turbine section having an airfoil that includes
- an airfoil wall defining a leading end, a trailing end, and suction and pressure sides joining the leading end and the trailing end, the airfoil wall being formed of a silicon-containing ceramic,
- a first environmental barrier topcoat of a first composition disposed on the suction side of the airfoil wall, the first environmental barrier topcoat is of a composition that is selected from HfO2, HfSiO4, and combinations thereof, and
- a second environmental barrier topcoat of a second, different composition disposed on the pressure side of the airfoil wall, the second environmental barrier topcoat is of a composition that is selected from a mixture of HfSiO4 and calcium aluminosilicate, Ca2Y8(SiO4)6O2, a mixture of HfO2, HfSiO4 and calcium aluminosilicate, and combinations thereof.
Dependencies are inferred from the claim text.